NUMERICAL STUDY OF ACOUSTIC EMISSION IN THE UNLOADING FAILURE PROCESS OF HETEROGENEOUS ROCKS
An elasto-plastic cellular automaton (F.PCA) model is used to study the acoustic emission (AE) characteristic in the unloading failure processes of heterogeneous rocks. Different heterogeneity is controlled by homogeneous index, where a low homogeneous index means strong heterogeneity. Initial stresses are firstly applied the rock specimen and then the stress in one direction is released with the stress in the other direction keeping constant. Calculated results indicate that the heterogeneity of rocks has a great influence on the AE modes. For the rock specimen with a very low homogeneous index, AE occurs almost in the whole unloading process, indicating that the tendentiousness of rock burst is weak. However, for the rock specimen with a high homogeneous index, when the stress is released, the AE occurs abruptly, indicating that the rock specimen has a strong tendentiousness of rock burst.
PENG-ZHI PAN XIA-TING FENG HUI ZHOU
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
555-560
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）